Christina Aguilera is in the pink with her Heidi hair at Berlin premiere of Burlesque... while Cher plays it casual

By DAILY MAIL REPORTER Chic v casual: Christina Aguilera wore a striking fuchsia chiffon halterneck dress by Alberta Ferretti, while co-star Cher dressed down in trousers and a leather jacket at the Berlin premiere of BurlesqueChristina Aguilera and Cher have been posing in a variety of revealing, designer dresses as they promote their new movie Burlesque around the world.But after wearing a